i am just about to put my motor together finally (306) and i need to know where i can find the replacement pintle caps (i think thats what there called?) i need a couple cause a couple on my 30's are cracked i need to find these asap or something? where?

help know one else knows this is one of the last things i have to get to get my motor together .................................................. .................................................. .......
.............................help!!